Rare diseases · Sign or symptom
Halberd-shaped pelvis
HP:0002826
What it means
An anomalous radiographic appearance of the developing pelvis, in which the greater ischiadic noth (incisura ischiadica major) is shallow and the pelvis takes on the appearance said to resemble a halberd (a weapon especially of the 15th and 16th centuries consisting typically of a battle-ax and pike mounted on a handle).
Rare diseases that can present with this1
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Also called: Halberd-shaped pelvis bone
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.